Description, Status codes returned – Intel Extensible Firmware Interface User Manual
Page 547
Protocols
— USB Support
Version 1.10
12/01/02
14-7
Description
This function is used to retrieve the USB host controller’s current state. The USB Host Controller
Protocol publishes three states for USB host controller, as defined in “Related Definitions” below.
If
State
is
NULL
, then
EFI_INVALID_PARAMETER
is returned. If a device error occurs while
attempting to retrieve the USB host controllers current state, then
EFI_DEVICE_ERROR
is
returned. Otherwise, the USB host controller’s current state is returned in
State
, and
EFI_SUCCESS
is returned.
Status Codes Returned
EFI_SUCCESS
The state information of the host controller was returned in
State
.
EFI_INVALID_PARAMETER
State is
NULL
.
EFI_DEVICE_ERROR
An error was encountered while attempting to retrieve the host controller’s
current state.
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